From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ingo Molnar Subject: Re: [bug, netconsole, SLUB] BUG skbuff_head_cache: Poison overwritten Date: Fri, 18 Jul 2008 11:05:06 +0200 Message-ID: <20080718090506.GO6875@elte.hu> References: <20080717214222.GA29449@elte.hu> <19f34abd0807171615s5b477d4cr22d3e9444bcf65df@mail.gmail.com> <20080717.190315.186892939.davem@davemloft.net> <19f34abd0807180003m7bdf832g141777751d7ea563@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: David Miller , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, penberg@cs.helsinki.fi, rjw@sisk.pl To: Vegard Nossum Return-path: Content-Disposition: inline In-Reply-To: <19f34abd0807180003m7bdf832g141777751d7ea563@mail.gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org * Vegard Nossum wrote: > But.. it could also be some random corruption coming from elsewhere. > Maybe even bad RAM (it's just a single bit anyway). But that's less > likely. ok, i looked at the logs once more and while i thought that it occured twice it only occured once: Jul 17 20:22:14 europe kernel: BUG skbuff_head_cache: Poison overwritten ... this would explain why my attempts to bisect and reproduce it failed. I got too excited about it being seemingly reproducible and possibly bisectable (memory corruption bugs rarely are). My overnight reboot-the-same-kernel tests didnt show anything either. It's a known-reliable system with thousands of bootups: Jul 17 20:20:54 europe kernel: Linux version 2.6.26-tip (mingo@europe) (gcc version 4.2.2) #3094 SMP Thu Jul 17 20:19:27 CEST 2008 ... but a hw fluke is never out of question. (It wasnt a particularly hot day but the evening was unusually humid, maybe that made the difference.) So lets close this for now, it's not a reproducible regression that we can act upon. I'll update this thread if anything new happens. Netconsole is reliable on this system in any case. Ingo